Goal:
    x : V.t  y : V.t  p : VSet.t  a : V.t  H : VSet.In a p
  ============================
   (y = a \/ VSet.In a p)


DEBUG:Going to execute:
Ltac.right; t_tauto_intuit
Level 3: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 4: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 4: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 4: Backtrace:

Failed to progress.
Level 4: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 5: Backtrace:

Failed to progress.
Level 4: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 4: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.